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Major energy suppliers may be stripped of the right to challenge an unfair energy price cap after a group of MPs suggested an appeal process could be used as a delaying tactic.

The parliamentary committee for business defied regulatory convention by saying energy companies should not be allowed to appeal the regulator’s set price for standard energy tariffs with the Competition and Market Authority.

Ahead of the Government’s first major intervention in the household energy market the MPs said suppliers may use a CMA appeal to “unnecessarily delay” the implementation of the price cap by this winter.

The latest political blow leaves energy companies at the mercy of Ofgem’s cost calculations with...